<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="../js/jquery-3.3.1.min.js"></script>
</head>
<body>
<ul>
    <li class="b">1</li>
    <li>1</li>
    <li>1</li>
    <li>1</li>
    <li>1</li>
</ul>
<script src="../js/test2.js"></script>
</body>
</html>